Something that's called The Black Hornet Nano Unmanned Air Vehicle sounds like it would be terrifying, but measuring in at about four inches long and weighing a scant 16 grams, it borders on being downright cute. The Black Hornet's diminutive scale doesn't stop it from aiding British troops in Afghanistan in seeking out enemy targets and checking if an area is safe before entering. This once again proves that it's not the size of your drone that matters -- it's how you use it.